On July 3, we were pleased to invite Dr. Hitoshi Kikuchi from Meitesu Hospital Vaccinations Center to give participants of OFW2015 a lecture about infectious disease in the world and preventation. Dr. Kikuchi told us a lot of knowledge about disease and the preventation, particularly for the fieldwork in the developing countries. His detailed explanation was quite helpful for our preparation for OFW2015 fieldwork in the Philippines.